Different Mode of Afferents Determines the Frequency Range of High Frequency Activities in the Human Brain: Direct Electrocorticographic Comparison between Peripheral Nerve and Direct Cortical StimulationDifferent Mode of Afferents Determines the Frequency Range of High Frequency Activities in the Human Brain: Direct Electrocorticographic Comparison between Peripheral Nerve and Direct Cortical Stimulationヒトの大脳皮質の高周波活動の周波数帯域は求心性入力機構の相違により規定される：末梢神経刺激と直接皮質刺激による皮質脳波の比較